Referenced redux.mjs file in README (reduxjs#3393)

Removed version from URL in unpkg link

README.md

@@ -104,7 +104,7 @@ Most commonly, people consume Redux as a collection of [CommonJS](https://github
 
 If you don't use a module bundler, it's also fine. The `redux` npm package includes precompiled production and development [UMD](https://github.com/umdjs/umd) builds in the [`dist` folder](https://unpkg.com/redux/dist/). They can be used directly without a bundler and are thus compatible with many popular JavaScript module loaders and environments. For example, you can drop a UMD build as a [`<script>` tag](https://unpkg.com/redux/dist/redux.js) on the page, or [tell Bower to install it](https://github.com/reduxjs/redux/pull/1181#issuecomment-167361975). The UMD builds make Redux available as a `window.Redux` global variable.
 
-The Redux source code is written in ES2015 but we precompile both CommonJS and UMD builds to ES5 so they work in [any modern browser](http://caniuse.com/#feat=es5). You don't need to use Babel or a module bundler to [get started with Redux](https://github.com/reduxjs/redux/blob/master/examples/counter-vanilla/index.html).
+The Redux source code is written in ES2015 but we precompile both CommonJS and UMD builds to ES5 so they work in [any modern browser](http://caniuse.com/#feat=es5). You don't need to use Babel or a module bundler to [get started with Redux](https://github.com/reduxjs/redux/blob/master/examples/counter-vanilla/index.html). You can even use the ES module build that's available at [`es/redux.mjs`](https://unpkg.com/redux/es/) which can be referenced using `type="module"` in your `script` tag or as a standard `import`.
 
 ### Complementary Packages